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image: Ancient Sex

Ancient Sex

By | October 19, 2014

Fossils of an extinct, armored fish challenge current understanding of when copulation and internal fertilization evolved in jawed vertebrates.

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image: A Rock and a Hard Place

A Rock and a Hard Place

By | July 1, 2014

Meet the retired chemical engineer who has made quite the impression on paleoentomology by uncovering ancient secrets of insect coitus.

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image: Geni-Tales

Geni-Tales

By | July 1, 2014

Penises and vaginas are not just simple sperm delivery and reception organs. They have been perfected by eons of sexual conflict.  

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image: Imaging Intercourse, 1493

Imaging Intercourse, 1493

By | July 1, 2014

For centuries, scientists have been trying to understand the mechanics of human intercourse. MRI technology made it possible for them to get an inside view.

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image: Sex in a Scanner

Sex in a Scanner

By | July 1, 2014

Meet Pek Van Andel, who conducted the famous MRI sex experiment, and see his research in action.

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image: Size Matters

Size Matters

By | July 1, 2014

The disproportionately endowed carabid beetle reveals that the size of female—and not just male—genitalia influences insemination success.

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image: Slippery Passion

Slippery Passion

By | July 1, 2014

Observe the sinuous sensuality of mating brook lampreys (Lampetra planeri).

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image: Speaking of Sex

Speaking of Sex

By | July 1, 2014

July 2014's selection of notable quotes

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image: Spineless Sex

Spineless Sex

By | July 1, 2014

Not to be outdone by vertebrates, invertebrates employ a suite of interesting structures and behaviors to accomplish procreation.

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image: Gifts During Sex Matter After

Gifts During Sex Matter After

By | October 28, 2013

Female spiders prefer sperm from males with gifts, a study shows.

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